Bump BenchmarkDotNet from 0.15.5 to 0.15.6

---
updated-dependencies:
- dependency-name: BenchmarkDotNet
  dependency-version: 0.15.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

performance/benchmark/PerformanceTests.csproj

@@ -14,7 +14,7 @@
     <NoWarn>CA1822</NoWarn>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="BenchmarkDotNet" Version="0.15.5" />
+    <PackageReference Include="BenchmarkDotNet" Version="0.15.6" />
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.15.5" />
   </ItemGroup>
   <ItemGroup>